MANN: THE ANTS OF BRAZIL. 425 
68. Pseudomyrma rufa F. Smith. 
Plate 7, fig. 56. 
Worker. Length 6 mm. 
Head, excluding mandibles, a little longer than broad, slightly 
narrowed behind, with convex sides and straight posterior border. 
Clypeus strongly keeled at middle; anterior border straight. Man- 
dibles well developed, the blades finely dentate. Antennae thick; 
first funicular joint two and a half times as long as broad; apical 
joint as long as the two preceding. Ocelli distinct, very close together. 
Pronotum transverse, depressed, strongly margined at sides, with 
narrowly rounded humeri. Mesonotum longer than broad, the 
surface with a disc-shaped impression at the posterior half. Meso- 
épinotal impression shallow. Epinotum more elevated than pro- 
and mesonotum, margined at sides basally, the surface distinctly 
concave; declivity as long as base, in profile straight. Petiole in 
profile elevated behind, above evenly rounded from base to apex, 
nearly as high as long; from above, more than twice as long as broad, 
narrowed above, with roundly margined sides and a narrow longitudi- 
nal impression at middle; anteroventral surface with a minute tooth; 
posterior surface concave. Postpetiole from above a little broader 
than long. Femora slightly thickened. 
Subopaque, granulosely punctate, with very sparse gray pile; 
pubescence not abundant, pollinose, white. Mandibles finely punc- 
tate and pilose. 
Color ferruginous, the meso- and epinotum infuscated. 
Female (dealated). Length 7.5mm. (Plate 7, fig. 56). 
Head, excluding mandibles, one and a third times as long as broad, 
the anterior and posterior borders of equal width; sides slightly con- 
vex, posterior border straight. Clypeus keeled at middle, the ante- 
rior border projecting, with a stout, triangular tooth at middle. 
Mandibles stout, the blade with a stout, triangular, basal tooth, then 
three minute teeth and long, pointed apical and subapical teeth. 
Thorax slender. Pronotum narrower than mesothorax, twice as broad 
as long, with subparallel, margined sides and narrowly rounded humeri. 
Petiole seen in profile much as in worker; from above it differs in 
having the surface flat, and not depressed except at the apex, where 
there is a deep excavation dividing it into two triangular portions. 
Sculpture and pilosity much as in the worker; the pubescence of 
gaster very fine and silky. 
